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The students all stood up when the teacher _______ (进入)the classroom.
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I wonder how many ______ (手术) ORBIS doctors perform during their visit to a poor country.
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父母总喜欢那自己的孩子和别人家的比? Parents always like to_______their own child_______others’.
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找规律,在括号内填入适当的数.0,1,3,8,21,55,______,______.
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lim x趋近于无穷大 sin3次方x分之tanx-sinx的极限
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